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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9314e7eea0ed17b5d6e88625d451496c151cbecce0d4a5f4e251b7c6da850a67' 
  AND token = 'jph/reFXvkun3KZzolRlmu5uZVDc1Zx4YuBIygyZDqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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