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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a288a59a23142192cd21be61cc8bf75e86276800538f580f4695315174982490' 
  AND token = 'SDoCOjhxoNVhmf6GdXv5AA94t+u7+N9NOu3UA8PrGlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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