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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd97daf3bda3905aefe5226e99ebb72f39e9ca419d8f72af30e1e8b3fc6f98c55' 
  AND token = 'PgDh/Pg7cByHftfkzJnDk7pU3qflpsc9mUC7tjEKpe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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