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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03695b1902fdfa9a81f55a3705d84fcf2d2cf5df98f68c1dd8e224ecd2dffe3' 
  AND token = 'A+gzuNI6z9atURaa49IoNIA6i+RbMXBr2vilruDoF3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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