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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '540813f7aaf72b18827c766022593ead4c4325c8d54b29ddd7e9efe3542a58cd' 
  AND token = 'DcvWIp6gmdlvW3PWA9z3OCVlm+VNykZ493RIXif7lXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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