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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a91641f2aeae5e0afe4a46b2e26016554e6d061a49f5bd30fce3d869b256db' 
  AND token = 'lTh/13izS97XeXD7H6SO6imQPiECdD/rVwzEhmtdif4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}