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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5783d07be632985f51c2d20e7eb9229a85c1923645f243aaf1cf391c6fb0e54b' 
  AND token = 'KX6yeD3/101e/3U+7bSvPKaGVxS/CaZSP8r6klQnlZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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