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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a30c201a86fac12617632a266920c17529426b89009f496ef1fbc7fb9fd6f90' 
  AND token = 'XYXWiD6fkJw7IVntFGMJdyXgh8Qa5fleQjlYePd7FOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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