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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093a4f69a820ec142a6d2481233a06a6d94945bea60f5e524ae1c61b50c99e41' 
  AND token = 'v+VmIH4QIOFKVPflBRWLP6esvc6voyFsat9ZAhY+1rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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