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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064a5b76566cebb6d239f60f23d75f9440054a4baf461038f72ba13b3ada501f' 
  AND token = '89r8nqOEXneIMe46hfZztoph7tzqs9FuY1Bm2IA9coM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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