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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87170c00f3da3af09b8dcf71a73c596d21d936c35a796ba087e9b9e363d27b2' 
  AND token = 'wbpljiG2/4hmxNOt9j5fa9yl8M+FXZC1aU+j39XxetQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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