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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e48e346247637a2c6b502454dc675a885de2514623b7a8a18bd8fe8811523633' 
  AND token = 'MI/ZbEpCZizodt/2oy87IhDmlbyQ6CBt4FYrwD6K91M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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