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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1dd0e2c374d8a3a33f8cb110021b5eea0c75882b13dda65dd1be519edf989be' 
  AND token = '7KNHtJPPXNlicBtsdqTXxm8jtL159qZfytJQ+cy4fXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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