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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0286542b814956a6900078387e47516a8e5e023793060a800c8692ddf5249de8' 
  AND token = 'zlhZPLYlufZ+Oo6WvEH7vXbktxH/o37S7FyPdYWf6ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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