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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '881959884aef951f7c506c2cf0e35fd09c3b71660ab93a8bfaa4124e8fd939e3' 
  AND token = 'Mept5lZvxLLtqQrRnYgpcaNO0ebrM3ul5yyqJjfbjvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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