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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a026ae858b7b2536ac74588d22e23e89d7ce2e8e0e80d8c48f77413091b27bd3' 
  AND token = 'oMvz6nPMtAzSYP6X7UR3XhCyXw3Xz9On/JrKhI0goRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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