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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f464a36c391f40722b2b719520234f15b7102e46e4fbf0530aabb211511bb87d' 
  AND token = 'dtc7uPti6acUry+PSzgBO8C93c0VaPxaJFqcam+zAxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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