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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ea2ddc602456d9e960eca9646efae9db0d9b0c91f6d32002262aaae347e8a6' 
  AND token = 'kTi4I565LblOvuHcpgYiFesmkClsb0/5Z5ujRQT1eTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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