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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771b7f19f4550d7e01b434c720acd1616e72f6d73e37e89facf47d532178705e' 
  AND token = 'jppmLu9FZg9vibCj7v0q/UTqKa9oSyB3ZvFZaWcAcw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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