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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c96edf0a9606f330cd9c45fecff4e0b427c28563356311b477597c906e7a75d' 
  AND token = 'VPHXE0rtZlewwh2KsgNBaYA57/AN3PGdx4TfF3D/LyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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