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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12f7339672f1a41136a5b0019e8ab6715e976dbb23c98b7f5dd32bcf41aec03b' 
  AND token = 'ncYJ3m+DuW+a+i5UsiBRC3N5Tr9S9qYiLRfaybr16SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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