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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a26e9400fb9d7d38bac2cee1f1b75f8795da9fc1c7adfc655e373d97b0df67' 
  AND token = '/0uXv2XbKW0kOX3qHxORDA88//SyfnKg2PMggkQIhjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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