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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5337c851fe0b94e04ed645c03ed702c4f991680eacf3e84f6e435deedca5cd' 
  AND token = '10t1Cuv+Sv+pfGTJmoeqJ8r01+MPFFEt7RX3SpJzLkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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