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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e738439cb179dc567310bfdd0854b82993038e60e8e720ae67e26bf3639b0a75' 
  AND token = 'n8jUpGgledgU1wZB1Pu7oa0wh0G86BGIpPjmNxeC6Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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