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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c86d8684f1ec455431341f6a6edda9af7b5820e7d675e8ecc9cb0eac72dc7ccf' 
  AND token = 'OVpDCpqGEONtzmrPS6gW/izkbY6Nxc0UsH6otfm4IhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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