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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d0534c4f0084efb05fd0048be229e878e3654292b94866026950fbc069f9ba7' 
  AND token = 'kwrclpBM/7WTAKhY91Wm6CSgHs06EqyM2wCxjFb5OCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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