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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a4da5b4aa725f5356677714b980fce143647d4459f4135bb5be67841eae70b' 
  AND token = 'APB4JCecBnMTIoUg8LvJS7ln9oCcglIsZ2T2lucnRBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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