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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b19a0ae9bb7e4e3c2e2029d857b75c42560a264e4bab4f449651a6b77a66476' 
  AND token = 'p6FBb1eVdqjAGgcrujRu/8JDNZqEb32TCH2UNd7Q+bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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