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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4936891d6012c7936b83143f897ffb79f386af3cc3283f00d28568031e8384' 
  AND token = 'N4nGaDSa9XJCPd25asBP1AjFnLZ26rk14Gl484zqQ10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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