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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f4c07b9baa41c09957717473882fe40502fe4040734e27f45fe80e3d37b4518' 
  AND token = '1fY7E28puWYcZsgneMKySmVX8uBVNUwSK3TH+0wIzlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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