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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b185407efa1376f36df23a5e6ada3eab5cd4217bd8893e3fcb8f9a194e6eb84' 
  AND token = 'bpZ3G3cwE0al4I7+WpTeyuauEfIOlBbYNpD4xqYA27w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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