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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2cc26aa8384da6cb834cdb210bfd04721e84841b6d4966cd5ab17a8a2ad717' 
  AND token = 'foZSw9u3RBMtrpqAT3p07iWeTw7MsQfNcDy7ZqAeGYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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