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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0e26c11b25560597fea970c984a808adb333a41758577750277dd3c97e765a' 
  AND token = 'a0BxBAMJbL1trkpPbgcVTrocj1Si1VaZNHjkHUWjCkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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