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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d328838936137b40d0c3d1935025ffb613c173d0ece72a8eaff3f776cff70bf' 
  AND token = 'St+f0Z54bhANlTMX/du5z5P5p1HNDAHPZir5J2evlNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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