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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16cbd1203d3fd17aafda23e91eaa4eca77fe0a161d7f53829969e7959c455e77' 
  AND token = 'd/1Y0vqOYlfQrWcb184bgnkK0YMl8tfgUEPOFot3ia8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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