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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9aa5b6495ee646d7893d56912958ab32e4e7aea10a0611b8a1f303928136cf1' 
  AND token = 'bBHq16pVXo+09OYl3RA1tYz1ucWlx+XkcPLSNygT91M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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