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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf12e314d628ed2a3bb59cefed14a0a5f1b9836c79fe68653ab5647b5808785e' 
  AND token = 'sNTGk81Enwdqe8/fiYf/6szZh31V5w7g8iqs58KLvpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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