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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8030ca95f55c1de53ebbbf904fd1755ec519d3df4972548e484bc3e99d273433' 
  AND token = 'myS2u8y/YoY1hOG6pztp+ClAeuzYeOW6EGw+x+qZmHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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