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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31394eabe9b42e7d9b6cfa442cc1574aa1ec2a55a068af829fe2eb7f60edcca' 
  AND token = 'FsawmXEZSNY0vazkVPaBmO2kOfLuUochGARGJ6wc6FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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