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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd0c93cdc4ef3d461c5a49af126a57779f5fd900b33ada971f6c011755bda75e' 
  AND token = 'sLLNWostAiBopmlVmJiEKXFCEyIhKEE06YBPvVY8Gxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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