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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0c1def29f831a7cd73ced8ac826605c85ef3c09ca654992f577026a3538237' 
  AND token = 'm+8WlLo6JF7jK3aSsHRVMSHTAnxjHyZ/ztqV+tgVHXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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