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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b79425ad3f58866c536cde6a01c43bd4afa8c7b51fc0b484425a8afd1a75a9d4' 
  AND token = 'O2gsPoZfs8if4HuMK58IJooftqrKAtj7S6MW+gbaDZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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