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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdeba2cc2c3ab0eb150987a33fd28c543f81fd49ade9721430c3c2815ddbcef0' 
  AND token = '9gV6wspHKnMIb9/t9NmrNIaM30pdtqRDI4NyJgLPx18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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