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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2cddb5835c194b2303a8f21ef0c6433a90672ab9df9c239cc5b0fa56064ba0' 
  AND token = 'iuZVEJirDgIENbB0gLsWNWjqIhqOKAVoQzZrkyS8+6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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