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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ea7098f31fd0a61a6a7123eaa8ad8d6013eb6ccd4e5e630b1a6d42eab2b1cb' 
  AND token = 'Q6VCiT5opUr/aZ9DXkkjzs0TZKwDyAtKyDQEzfndFmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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