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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c8c15e6e82bdfc66bed92c29614977e1c99958c414bd80ecc1c1330b9423aa3' 
  AND token = 'DaujcTGWEhEkXP76pF3Ezv6eHbkRe/87c1Zl0Sd+Cjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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