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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3333b0fdd5462135339f60b0020402a452531b66e52be1228170abe6dcf98b0' 
  AND token = 'd9Ai+hpCM55NBUhuoOQ3JbAMQQsuTYbGCpKwt262Gdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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