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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '622ac5fb9bf13ece01f5554d4b7e3b0b5885fa2b473b97d7632105fa682890db' 
  AND token = '17BTJEtEDQyP3/0p7SUY2CN4wI/CJRB190IEpuGAupk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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