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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f6b92ba96a6c9a243d536774476d4c27373237aec6af75c5bff6f213a3940b' 
  AND token = 'taPkHl63FeGnZbGt3NyE/GRGyVu77a452sylXrwQyh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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