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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bab843f0fec42833082649ee5bd2650b02bc542eed0c90c6212f7ecd1c17ce4' 
  AND token = 'ZygM3ldrzeIuqc30T1vPgx7aW1ZstKX1XcA7bnw3eNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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