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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ca71d1513dfa482405a00b6ac950e46c6f271471cca594d0879580016edc53' 
  AND token = 'nO0qteONgRS/b+5iVc7ngqmfpTi9rkPbZzryGaI3VFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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