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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2733ed0388b0cb18cb0ce2ad88da2dadc54b818030aff37178f9fe742d0e3a8' 
  AND token = 'FhdsD5kGx7TLPKRd6gr7et0ctApGQW5D9Slm6GCtY48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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