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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b0448881918dba415eb8278e5c53721140e907beb37621203bcd1333bad953' 
  AND token = 'B7CLcKRrYtcn5AkZH7mTCPKratLJbXbq6M772Zz1plI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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