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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717a9fcd1cfa1bc291cb57eda666884e86573a53b65f2ebdf7088c1a9fbe37b4' 
  AND token = 'lGkgagx/f4r4H46jJKO0QaBcRp/Ub3/5g8lNeFoGlBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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