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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd98f841cf10723d75ccef5ef92d66c422aed862859aa42c254e4bf06f3889e3' 
  AND token = 'Q552sWV/pYUuO6+/BrlONX5Ue0jM1TWKsDBHa89zDzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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