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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1730f54545a7ecca16cd82a6dc3d1300447e288e76d3555c2bd2806b7c40733d' 
  AND token = 'mPXpRZaU2d6FL8LgXjaI8nhV4+PyYatZoV/A/QaKJ14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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