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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf67926fa468d7a61295e4ed642fadb95fda2dc5b2ed02e6c2cb677fc5d548c' 
  AND token = 'MuYdqsCYD4cAiEUrUoxKVb+oEZjoaZOFUZ+GvNszfv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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