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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6968f585da51107945d5f134da1ac90e38b6247baafc5f823391166f0cc8aafe' 
  AND token = '4Mw8Pq3YXyQx3bCc4LIMtBjiOhdD5SUda+5Px0hwraU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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